-sub trysend {
- my ($sign, $desc) = @_;
- my $speed = 2 ** 16;
- my $ok = 0;
- while (!$ok && (($speed /= 2) >= 1)) {
- my $r = '';
- eval {
- local $SIG{ALRM} = sub { die 'timeout' };
- local $SIG{__WARN__} = sub { die 'do not want warnings' };
- my $a = (int(300 / $speed) || 1);
- $a = 10 if $a > 10;
- alarm $a;
- kill SIGHUP => $pid;
- msend 'x' => $pid, speed => $speed, sign => $sign;
- $r = <$rdr>;
- };
- kill SIGHUP => $pid if $@;
- alarm 0;
- if (!defined $r) { # Something bad happened, respawn
- close $rdr or die "close() failed: $!";
- slaughter $pid;
- ($pid, $rdr) = spawn;
- $speed *= 2; # Retry this speed
- } else {
- chomp $r;
- my ($p, $m) = split /:/, $r;
- $ok = ($m eq 'x') && ($p == ($sign ? $$ : 0)) if defined $m and defined $p;
- }
- }
- ok($ok, $desc);
-}